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The least common multiple (LCM) of 5 and 7 is 35, not the least common denominator (LCD). The LCD is used in adding or subtracting fractions and is the least common multiple of the denominators. In this case, since 5 and 7 are prime numbers and have no common factors, the LCD is simply the product of the two denominators, which is 5 * 7 = 35.
There IS only one LCD. The word least is a superlative, which means there can be only one. LCD(79, 90) = 7110
About 100w for a cathode ray tube and 60w for an LCD.
LCM(47, 35) = 1645.